<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <script src="../react18/react.development.js"></script>
  <script src="../react18/react-dom.development.js"></script>
  <script src="../react18//babel.min.js"></script>
</head>
<body>
  <div id="app"> </div>
  <button id="btn">修改vDOM,重新渲染</button>
  <script type="text/babel">
    const arr = ["html","css","js","jq"]
    const vDOM=(
     <ul>
      {
        arr.map(item=>{
          return <li>{item}</li>
        })
      }
      </ul>
    )

    // 渲染到页面上
 const root= ReactDOM.createRoot(document.getElementById("app"))
 root.render(vDOM)

   //给按钮绑定点击事件,修改数据 然后重新得到新的vDOM 重新渲染
    const oBtn=document.getElementById("btn");
    oBtn.onclick=function(){
      arr.push('react')
      const vDOM=(
        <ul>
      {
          arr.map(item=>{
          return <li>{item}</li>
        })
      }
      </ul>
    
    )
    root.render(vDOM)
    }
  </script>
</body>
</html>